package com.nowcoder.community.entity;

/**
 * 分页相关信息
 * @author ：LY
 * @date ：Created in 2021/1/19 17:44
 * @modified By：
 */
public class Page {
    //当前页码
    private int current = 1;
    //显示数量
    private int limit = 10;
    //数据总数(用于计算总页数)
    private int rows;
    //查询路径(用于复用分页链接)
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if (current >=1)
        this.current = current;
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if (limit>=1&&limit<=100)
        this.limit = limit;
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
        if (rows >= 0)
        this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    /**
     * 获取当前页的起始行
     * @return
     */
    public int getOffset(){
         //current * limit -limit(每页显示多少)
        return (current-1) *limit;
    }
    /**
     * 获取总页数
     */
    public int getTotal(){
        //rows/limit [+1]
        if (rows %limit ==0){
            return rows/limit;
        }else {
            return rows/limit+1;
        }
    }

    /**
     * 获取起始页码
     * @return
     */
    public int getFrom(){
        int from = current -2;
        return from < 1 ? 1:from;
    }

    /**
     * 获取结束页码
     */
    public int getTo(){
            int to = current +2;
            int total = getTotal();
            return to >total?total:to;
    }
}
